Step 1: What do you need ?

All you need is :
- binocular
- some carton
- scissors
- a pen
- a compass
- a digital camera and a color printer (or some color pen or some paint)

Step 2: Prepare the carton board ...

Cut the box to get a beautifull carton board.

This board must be larger than your head.

Step 3: Make the two holes ...

Fit your binocular to your face (distance between your eyes), and put it on your board where you're planing to make the two holes.

With a pen, you draw the circles.

Then, with your scissors, you make the two holes. Be carefull : they must not be too large, or the mask will not stay on your binocular !

Insert your binocular and try to watch yourself through a mirror (Stay at few meters away from the mirror. As the mirror will double the distance, you should be able to easily get a sharp image of yourself with the mask.)

Step 4: Dress your BinoMask !

So far, you'll be anonymous (as no one will recognize your face), but you're still visible !
And if one of your neighbours see you with your round and large skull, and your two large and black eyes, they may think your home got invaded by aliens, and may call MIB ...

That's why we're going to make your BinoMask almost "invisible".

To do so, with you digital camera, from the outside, take a picture of the window you're planing to look through.

With a picture editor of your choice (Gimp, Photoshop), resize the photo and print it.

Once done, you cut the two holes and glue it over your BinoMask, and voila ! Tada ! You are (almost) invisible !

That's really a lot better than I expected from the tiny preview pictures. Photo-real camo is a big thing these days, and very effective. Used for a single place like this, it will be even more effective. Nice idea.